But really, there are some people (generally not pros) that always spam the unit they find the most powerful, no matter how many counters it has on the field. So people spammed heavies and it failed miserably in all serious matches but community still decided to limit them. Now they are spamming rocket artillery and win if you cant kill it. If you limit the arty they will spam something else, its just how their brains work.
I guess you're right. I play mostly Brits n USA and am 250 / 450 so I'm pretty average. I just feel like if the US get 2/3 Calliopes you can completely decimate the Axis. I guess some Rocket Arty is considerably better than others, so I don't know limiting would be better than, say, editing their stats, but when games turn into arty fests it really isn't fun to play.
I think the Katyusha is really nicely balanced, however.